{"id":680,"date":"2021-06-25T23:47:03","date_gmt":"2021-06-25T23:47:03","guid":{"rendered":"https:\/\/mc.scsiraidguru.com\/?page_id=680"},"modified":"2024-03-03T15:33:20","modified_gmt":"2024-03-03T15:33:20","slug":"lcd-20x4-i2c","status":"publish","type":"page","link":"https:\/\/mc.scsiraidguru.com\/index.php\/i2c\/lcd-20x4-i2c\/","title":{"rendered":"LCD 20×4 I2C"},"content":{"rendered":"\t\t
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I started by running the I2C address scanning (Red code)<\/p><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/section>

Scanning\u2026
I2C device found at address 0x01\u00a0 !
I2C device found at address 0x02\u00a0 !
I2C device found at address 0x03\u00a0 !
I2C device found at address 0x04\u00a0 !
I2C device found at address 0x27\u00a0 !
done<\/p><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/section>

Sunfounder LCD 20\u00d74: I2C device found at address 0x27 !<\/p><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/section>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Each I2C LCD screen has three pads: A0, A1, and A2.\u00a0 Below is the table that shows how to solder the pads to change the address.\u00a0\u00a0 Below the table is a picture of the I2C LCD screen pads on the right side.\u00a0\u00a0 Soldering them can be tricky to do.\u00a0\u00a0 <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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A0<\/td>A1<\/td>A2<\/td>Hex<\/td><\/tr>
open<\/td>open<\/td>open<\/td>0x27<\/td><\/tr>
closed<\/td>open<\/td>open<\/td>0x26<\/td><\/tr>
open<\/td>closed<\/td>open<\/td>0x25<\/td><\/tr>
closed<\/td>closed<\/td>open<\/td>0x24<\/td><\/tr>
open<\/td>open<\/td>closed<\/td>0x23<\/td><\/tr>
closed<\/td>open<\/td>closed<\/td>0x22<\/td><\/tr>
open<\/td>closed<\/td>closed<\/td>0x21<\/td><\/tr>
closed<\/td>closed<\/td>closed<\/td>0x20<\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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#include <LiquidCrystal_I2C.h> \/\/ Library for I2C LCD displays
#include <wire.h>
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\/\/ Include the required Wire library for I2C
\/\/ Include the libraries:
\/\/ LiquidCrystal_I2C.h: https:\/\/github.com\/johnrickman\/LiquidCrystal_I2C
#include <LiquidCrystal.h>  \/\/ Library for I2C communication
#include <Wire.h> \/\/ Library for LCD<\/pre>
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\/\/ Wiring: SDA pin is connected to A4 and SCL pin to A5.
\/\/ Connect to LCD via I2C, default address 0x27 (A0-A2 not jumpered)
LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 20, 4); \/\/ Change to (0x27,20,4) for 20\u00d74 LCD.

#include 
int x = 0;
int LED = 13;

void setup()
{

\u00a0\/\/ Initiate the LCD:
\u00a0 lcd.init();
\u00a0 lcd.backlight();

\/\/ I2C counter for LEDs \u00a0
pinMode (LED, OUTPUT);
\/\/ Start the I2C Bus as Master
Wire.begin();
\/\/ I2C counter for LEDs \u00a0

\/*
\/\/ I2C Scanner Code
Serial.begin(9600);
while (!Serial);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/\u00a0 wait for serial monitor
Serial.println(\u201c\\nI2C Scanner\u201d);
\/\/ I2C Scanner Code
*\/

}

void loop() {

\/\/LCD I2C 20X4
lcd.setCursor(3, 0);\u00a0\u00a0\u00a0 \/\/ 4th column 1st row
lcd.print(\u201cWelcome aboard\u201d);

lcd.setCursor(8, 1);\u00a0\u00a0\u00a0 \/\/ 9th column 2nd row
lcd.print(\u201cthe\u201d);

lcd.setCursor(6, 2);\u00a0\u00a0\u00a0 \/\/ 7th column 3rd row
lcd.print(\u201cHeart of\u201d);

lcd.setCursor(2, 3);\u00a0\u00a0\u00a0\u00a0 \/\/ 3rd column 4th row
lcd.print(\u201cStainless Steel\u201d);
\/\/LCD I2C 20X4

\/\/ I2C counter for LEDs\u00a0\u00a0 \u00a0
x++; \/\/ Increment x

\/\/From Left to Right
\/\/ First UNO
Wire.beginTransmission(1); \/\/ transmit to device #1
Wire.write(x); \/\/ sends x
Wire.endTransmission(); \/\/ stop transmitting

\/\/Second UNO
Wire.beginTransmission(2); \/\/ transmit to device #2
Wire.write(x); \/\/ sends x
Wire.endTransmission(); \/\/ stop transmitting

\/\/Mega in the Middle

\/\/Third UNO
Wire.beginTransmission(3); \/\/ transmit to device #3
Wire.write(x); \/\/ sends x
Wire.endTransmission(); \/\/ stop transmitting

\/\/Fourth UNO
Wire.beginTransmission(4); \/\/ transmit to device #4
Wire.write(x); \/\/ sends x
Wire.endTransmission(); \/\/ stop transmitting

if ( (x == 3) || (x == 6)) {
digitalWrite(LED, HIGH);
}
else {
digitalWrite(LED, LOW);
}

if (x == 7) x = 0; \/\/ `reset x once it gets 6
delay(1000);
\/\/ I2C counter for LEDs \u00a0

\/*
\/\/ I2C Scanner Code
byte error, address;
\u00a0 int nDevices;

\u00a0 Serial.println(\u201cScanning\u2026\u201d);

\u00a0 nDevices = 0;
\u00a0 for(address = 1; address < 127; address++ )
\u00a0 {
\u00a0\u00a0\u00a0 \/\/ The i2c_scanner uses the return value of
\u00a0\u00a0\u00a0 \/\/ the Write.endTransmisstion to see if
\u00a0\u00a0\u00a0 \/\/ a device did acknowledge to the address.
\u00a0\u00a0\u00a0 Wire.beginTransmission(address);
\u00a0\u00a0\u00a0 error = Wire.endTransmission();

\u00a0\u00a0\u00a0 if (error == 0)
\u00a0\u00a0\u00a0 {
\u00a0\u00a0\u00a0\u00a0\u00a0 Serial.print(\u201cI2C device found at address 0x\u201d);
\u00a0\u00a0\u00a0\u00a0\u00a0 if (address<16)
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Serial.print(\u201c0\u201d);
\u00a0\u00a0\u00a0\u00a0\u00a0 Serial.print(address,HEX);
\u00a0\u00a0\u00a0\u00a0\u00a0 Serial.println(\u201d\u00a0 !\u201d);

\u00a0\u00a0\u00a0\u00a0\u00a0 nDevices++;
\u00a0\u00a0\u00a0 }
\u00a0\u00a0\u00a0 else if (error==4)
\u00a0\u00a0\u00a0 {
\u00a0\u00a0\u00a0\u00a0\u00a0 Serial.print(\u201cUnknown error at address 0x\u201d);
\u00a0\u00a0\u00a0\u00a0\u00a0 if (address<16)
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Serial.print(\u201c0\u201d);
\u00a0\u00a0\u00a0\u00a0\u00a0 Serial.println(address,HEX);
\u00a0\u00a0\u00a0 }\u00a0\u00a0 \u00a0
\u00a0 }
\u00a0 if (nDevices == 0)
\u00a0\u00a0\u00a0 Serial.println(\u201cNo I2C devices found\\n\u201d);
\u00a0 else
\u00a0\u00a0\u00a0 Serial.println(\u201cdone\\n\u201d);

\u00a0 delay(5000);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ wait 5 seconds for next scan
\/\/ I2C Scanner Code
*\/

}<\/pre>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"
I started by running the I2C address scanning (Red code) Scanning\u2026I2C device found at address 0x01\u00a0 !I2C device found at address 0x02\u00a0 !I2C device found at address 0x03\u00a0 !I2C device found at address 0x04\u00a0 !I2C device found at address 0x27\u00a0 !done Sunfounder LCD 20\u00d74: I2C device found at address 0x27 ! Each I2C LCD screen […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":653,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"custom","ocean_center_header_left_menu":"0","ocean_custom_header_template":"7100","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","osh_disable_topbar_sticky":"default","osh_disable_header_sticky":"default","osh_sticky_header_style":"default","osh_sticky_header_effect":"","osh_custom_sticky_logo":0,"osh_custom_retina_sticky_logo":0,"osh_custom_sticky_logo_height":0,"osh_background_color":"","osh_links_color":"","osh_links_hover_color":"","osh_links_active_color":"","osh_links_bg_color":"","osh_links_hover_bg_color":"","osh_links_active_bg_color":"","osh_menu_social_links_color":"","osh_menu_social_hover_links_color":"","footnotes":""},"class_list":["post-680","page","type-page","status-publish","hentry","entry"],"yoast_head":"\nLCD 20x4 I2C -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mc.scsiraidguru.com\/index.php\/i2c\/lcd-20x4-i2c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LCD 20x4 I2C -\" \/>\n<meta property=\"og:description\" content=\"I started by running the I2C address scanning (Red code) Scanning\u2026I2C device found at address 0x01\u00a0 !I2C device found at address 0x02\u00a0 !I2C device found at address 0x03\u00a0 !I2C device found at address 0x04\u00a0 !I2C device found at address 0x27\u00a0 !done Sunfounder LCD 20\u00d74: I2C device found at address 0x27 ! 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